Here is what worked for me. First I imported the data from my TD Ameritrade 1099B. Wherever there was a negative value for the proceeds in the box 1d, I entered that same value as a positive number in the cost basis box 1e and in the proceeds box 1d I entered 0. A blank in 1d might also work. This way the gain is still negative or correct as it was before or should be. The overall total for gain/loss is the same as before, but now when doing the smart check, everything works out error free.
Yes this is manual, but it only means changing two boxes per transaction. I had to change 26 entries, about 15 min work. I have not seen any other instructions on this board work. I hope this helps.
Yes, TD Ameritrade should change their form to avoid negative proceeds and TurboTax should be smart enough to recognize this error and deal with it.
